const CC = Components.Constructor;
const BinaryInputStream = CC(
  "@mozilla.org/binaryinputstream;1",
  "nsIBinaryInputStream",
  "setInputStream"
);

function utf8decode(s) {
  return decodeURIComponent(escape(s));
}

function utf8encode(s) {
  return unescape(encodeURIComponent(s));
}

function handleRequest(request, response) {
  var bodyStream = new BinaryInputStream(request.bodyInputStream);
  var result = [];
  var requestBody = "";
  while ((bodyAvail = bodyStream.available()) > 0) {
    requestBody += bodyStream.readBytes(bodyAvail);
  }

  if (request.method == "POST") {
    var contentTypeParams = {};
    request
      .getHeader("Content-Type")
      .split(/\s*\;\s*/)
      .forEach(function (s) {
        if (s.indexOf("=") >= 0) {
          let [name, value] = s.split("=");
          contentTypeParams[name] = value;
        } else {
          contentTypeParams[""] = s;
        }
      });

    if (
      contentTypeParams[""] == "multipart/form-data" &&
      request.queryString == ""
    ) {
      requestBody
        .split("--" + contentTypeParams.boundary)
        .slice(1, -1)
        .forEach(function (s) {
          let headers = {};
          let headerEnd = s.indexOf("\r\n\r\n");
          s.substr(2, headerEnd - 2)
            .split("\r\n")
            .forEach(function (str) {
              // We're assuming UTF8 for now
              let [name, value] = str.split(": ");
              headers[name] = utf8decode(value);
            });

          let body = s.substring(headerEnd + 4, s.length - 2);
          if (
            !headers["Content-Type"] ||
            headers["Content-Type"] == "text/plain"
          ) {
            // We're assuming UTF8 for now
            body = utf8decode(body);
          }
          result.push({ headers, body });
        });
    }
    if (
      contentTypeParams[""] == "text/plain" &&
      request.queryString == "plain"
    ) {
      result = utf8decode(requestBody);
    }
    if (
      contentTypeParams[""] == "application/x-www-form-urlencoded" &&
      request.queryString == "url"
    ) {
      result = requestBody;
    }
  } else if (request.method == "GET") {
    result = request.queryString;
  }

  // Send response body
  response.setHeader("Content-Type", "text/plain; charset=utf-8", false);
  response.write(utf8encode(JSON.stringify(result)));
}
